Malicious PDF — malware analysis report

Static analysis result for SHA-256 7521b1eb17919949…

MALICIOUS

PDF

71.0 KB Created: 2021-10-02 14:17:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: d62eb72ba6409e38e5ffc6717f4c8479 SHA-1: 5752392d444ce54df23ded215599518b8d0b50a5 SHA-256: 7521b1eb1791994922038343c8d0fdda8b920fecf25b2fbccae1a89d1473d6e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ML classifiers and ClamAV, indicating it's a Pdf.Phishing.Trojan. It contains numerous links to compromised websites, suggesting a phishing or malware distribution scheme. The PDF's structure and embedded links point towards an attempt to exploit users by directing them to potentially harmful content hosted on compromised CMS uploads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://ascensionchina.com/userfiles/file/kipibarar.pdf In PDF document text
    • http://e-hematologica.com/users/file/85127567509.pdfIn PDF document text
    • https://gym-rectif.fr/ckfinder/userfiles/files/84458002325.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/jeginugopuwajazi.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614b21364aa18---jubosuzokuset.pdfIn PDF document text
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/86624504644.pdfIn PDF document text
    • http://metall-press.ru/files/delebojitozeleronoboxu.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613e008664610---66954518047.pdfIn PDF document text
    • http://wuyioutdoor.com/userfiles/file/71052563013.pdfIn PDF document text
    • http://domadoma.cz/userfiles/file/98192892737.pdfIn PDF document text
    • https://equipelec.fr/ckfinder/userfiles/files/1095312000.pdfIn PDF document text
    • http://goldenagegroup.vip/userfiles/file/bitexufe.pdfIn PDF document text
    • http://stroytehcentr.ru/images/file/kasusodiguxofu.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16156ea5b7e562---wisege.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/debumi.pdfIn PDF document text
    • https://indiansabroad.uk/userfiles/file/75133086822.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614d6648db9ac---zanaxelesopugatowobo.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/161304e93970a7---71970862768.pdfIn PDF document text
    • http://geotersrl.it/file/patakugerawataluf.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/6067394823.pdfIn PDF document text
    • https://skopjemuzikon.pmgrecordings.com/ckfinder/userfiles/files/xirusenuvurizadebixisema.pdfIn PDF document text
    • http://newshop.jp/archive/file/18280076447.pdfIn PDF document text
    • https://heureka-cz.eu/files/60122668423.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/93185d77839d64c2588146ddb72dbebe/85136763066.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=an+inquiry+letterPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB367 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB7D 9992 bytes
SHA-256: f3b374f166506defce708b497ce35fabf42f6f0d5d5e54c1183cce60e031f3b4
font_02_sfnt_off0000e1b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B8 17632 bytes
SHA-256: eeffa7b934f609bcfc7db3a9d49b59229ab8925274cd26ac651c3971885afa89